The Water Status Measurements Associated with Plant Growth

• NONAMI Hiroshi

  Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University

抄録

The process of cell elongation from the viewpoint of plant-water relations and the effect of excision in the zone of elongation on changes in the water status are discussed. The excision effect on changes in water potential was evaluated after measuring turgor before excision and after excision in growing tulip tepals, and it was found that the size of wall relaxation was about 0.04 MPa. In mature tissues, there is no wall relaxation due to excision, and thus, the water status can be cross-checked by using a pressure chamber, a pressure probe and psychrometers. It was found that water potential of the apoplast is equal to the sum of the matric potential and the osmotic potential of the apoplast solution in the mature tissue. The symplast water potentials of epidermal cells and mesophyll cells were measured with the cell pressure probe, having the same values of water potentials measured with the psychrometer. Volume-averaged cell turgor and osmotic potentials were similar to the corresponding values measured in tissues with the psychrometer. In elongating tissues and mature tissues, it was confirmed that water potential can be expressed as the sum of pressure potential and osmotic potential in both the apoplast and symplast.

収録刊行物

• Ｅｎｖｉｒｏｎｍｅｎｔ　Ｃｏｎｔｒｏｌ　ｉｎ　Ｂｉｏｌｏｇｙ

  Ｅｎｖｉｒｏｎｍｅｎｔ　Ｃｏｎｔｒｏｌ　ｉｎ　Ｂｉｏｌｏｇｙ 45 (4), 201-214, 2007

  日本生物環境工学会

キーワード

• cell elongation
• growth-induced water potential
• hydraulic conductance
• matric potential
• osmotic potential

詳細情報

• CRID: 1390001205259918336
• NII論文ID: 10021229037
• NII書誌ID: AA12029220
• DOI: 10.2525/ecb.45.201
• ISSN: 18830986
• ISSN: 1880554X
• NDL書誌ID: 9349462
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9349462
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可